according to the error message it looks like your result from the ActivityStarter.AfterActivity event is an empty string?
what about debugging your blocks to find out the result?
Taifun
how to do that I don’t know
the most simple method to debug something is to display the result in a label, and generally use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
Taifun
From where can i get application password
Wordpress admin account password
It seems to me that you are API experts 
Do you have an IDEA for my API problem?
I would like to upload photos to my own server independently of Goole and Co.
I’m really desperate
THANK
Since wordpress 5.7.0 (if I’m not mistaken), pplication password is merged into wordpress core. If you guys work with wordpress rest API, try all endpoints before using it to kodular.Use tools like postman or insomnia
I can"t say much about wordpress as this is kodular forum.
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